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249
leenkx/Sources/iron/object/ParticleSystem.hx
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249
leenkx/Sources/iron/object/ParticleSystem.hx
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package iron.object;
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#if lnx_particles
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import kha.graphics4.Usage;
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import kha.arrays.Float32Array;
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import iron.data.Data;
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import iron.data.ParticleData;
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import iron.data.SceneFormat;
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import iron.system.Time;
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import iron.math.Mat4;
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import iron.math.Quat;
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import iron.math.Vec3;
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import iron.math.Vec4;
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class ParticleSystem {
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public var data: ParticleData;
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public var speed = 1.0;
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var particles: Array<Particle>;
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var ready: Bool;
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var frameRate = 24;
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var lifetime = 0.0;
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var animtime = 0.0;
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var time = 0.0;
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var spawnRate = 0.0;
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var seed = 0;
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var r: TParticleData;
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var gx: Float;
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var gy: Float;
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var gz: Float;
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var alignx: Float;
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var aligny: Float;
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var alignz: Float;
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var dimx: Float;
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var dimy: Float;
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var tilesx: Int;
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var tilesy: Int;
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var tilesFramerate: Int;
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var count = 0;
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var lap = 0;
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var lapTime = 0.0;
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var m = Mat4.identity();
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var ownerLoc = new Vec4();
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var ownerRot = new Quat();
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var ownerScl = new Vec4();
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public function new(sceneName: String, pref: TParticleReference) {
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seed = pref.seed;
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particles = [];
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ready = false;
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Data.getParticle(sceneName, pref.particle, function(b: ParticleData) {
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data = b;
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r = data.raw;
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if (Scene.active.raw.gravity != null) {
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gx = Scene.active.raw.gravity[0] * r.weight_gravity;
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gy = Scene.active.raw.gravity[1] * r.weight_gravity;
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gz = Scene.active.raw.gravity[2] * r.weight_gravity;
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}
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else {
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gx = 0;
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gy = 0;
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gz = -9.81 * r.weight_gravity;
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}
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alignx = r.object_align_factor[0] / 2;
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aligny = r.object_align_factor[1] / 2;
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alignz = r.object_align_factor[2] / 2;
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lifetime = r.lifetime / frameRate;
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animtime = (r.frame_end - r.frame_start) / frameRate;
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spawnRate = ((r.frame_end - r.frame_start) / r.count) / frameRate;
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for (i in 0...r.count) particles.push(new Particle(i));
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ready = true;
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});
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}
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public function pause() {
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lifetime = 0;
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}
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public function resume() {
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lifetime = r.lifetime / frameRate;
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}
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public function update(object: MeshObject, owner: MeshObject) {
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if (!ready || object == null || speed == 0.0) return;
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// Copy owner world transform but discard scale
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owner.transform.world.decompose(ownerLoc, ownerRot, ownerScl);
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object.transform.loc = ownerLoc;
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object.transform.rot = ownerRot;
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// Set particle size per particle system
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object.transform.scale = new Vec4(r.particle_size, r.particle_size, r.particle_size, 1);
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object.transform.buildMatrix();
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owner.transform.buildMatrix();
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object.transform.dim.setFrom(owner.transform.dim);
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dimx = object.transform.dim.x;
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dimy = object.transform.dim.y;
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if (object.activeTilesheet != null) {
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tilesx = object.activeTilesheet.raw.tilesx;
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tilesy = object.activeTilesheet.raw.tilesy;
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tilesFramerate = object.activeTilesheet.raw.framerate;
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}
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// Animate
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time += Time.realDelta * speed;
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lap = Std.int(time / animtime);
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lapTime = time - lap * animtime;
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count = Std.int(lapTime / spawnRate);
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updateGpu(object, owner);
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}
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public function getData(): Mat4 {
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var hair = r.type == 1;
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m._00 = r.loop ? animtime : -animtime;
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m._01 = hair ? 1 / particles.length : spawnRate;
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m._02 = hair ? 1 : lifetime;
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m._03 = particles.length;
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m._10 = hair ? 0 : alignx;
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m._11 = hair ? 0 : aligny;
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m._12 = hair ? 0 : alignz;
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m._13 = hair ? 0 : r.factor_random;
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m._20 = hair ? 0 : gx * r.mass;
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m._21 = hair ? 0 : gy * r.mass;
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m._22 = hair ? 0 : gz * r.mass;
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m._23 = hair ? 0 : r.lifetime_random;
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m._30 = tilesx;
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m._31 = tilesy;
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m._32 = 1 / tilesFramerate;
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m._33 = hair ? 1 : lapTime;
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return m;
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}
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function updateGpu(object: MeshObject, owner: MeshObject) {
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if (!object.data.geom.instanced) setupGeomGpu(object, owner);
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// GPU particles transform is attached to owner object
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}
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function setupGeomGpu(object: MeshObject, owner: MeshObject) {
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var instancedData = new Float32Array(particles.length * 3);
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var i = 0;
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var normFactor = 1 / 32767; // pa.values are not normalized
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var scalePosOwner = owner.data.scalePos;
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var scalePosParticle = object.data.scalePos;
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var particleSize = r.particle_size;
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var scaleFactor = new Vec4().setFrom(owner.transform.scale);
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scaleFactor.mult(scalePosOwner / (particleSize * scalePosParticle));
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switch (r.emit_from) {
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case 0: // Vert
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var pa = owner.data.geom.positions;
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for (p in particles) {
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var j = Std.int(fhash(i) * (pa.values.length / pa.size));
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instancedData.set(i, pa.values[j * pa.size ] * normFactor * scaleFactor.x); i++;
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instancedData.set(i, pa.values[j * pa.size + 1] * normFactor * scaleFactor.y); i++;
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instancedData.set(i, pa.values[j * pa.size + 2] * normFactor * scaleFactor.z); i++;
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}
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case 1: // Face
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var positions = owner.data.geom.positions.values;
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for (p in particles) {
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// Choose random index array (there is one per material) and random face
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var ia = owner.data.geom.indices[Std.random(owner.data.geom.indices.length)];
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var faceIndex = Std.random(Std.int(ia.length / 3));
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var i0 = ia[faceIndex * 3 + 0];
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var i1 = ia[faceIndex * 3 + 1];
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var i2 = ia[faceIndex * 3 + 2];
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var v0 = new Vec3(positions[i0 * 4], positions[i0 * 4 + 1], positions[i0 * 4 + 2]);
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var v1 = new Vec3(positions[i1 * 4], positions[i1 * 4 + 1], positions[i1 * 4 + 2]);
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var v2 = new Vec3(positions[i2 * 4], positions[i2 * 4 + 1], positions[i2 * 4 + 2]);
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var pos = randomPointInTriangle(v0, v1, v2);
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instancedData.set(i, pos.x * normFactor * scaleFactor.x); i++;
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instancedData.set(i, pos.y * normFactor * scaleFactor.y); i++;
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instancedData.set(i, pos.z * normFactor * scaleFactor.z); i++;
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}
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case 2: // Volume
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var scaleFactorVolume = new Vec4().setFrom(object.transform.dim);
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scaleFactorVolume.mult(0.5 / (particleSize * scalePosParticle));
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for (p in particles) {
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instancedData.set(i, (Math.random() * 2.0 - 1.0) * scaleFactorVolume.x); i++;
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instancedData.set(i, (Math.random() * 2.0 - 1.0) * scaleFactorVolume.y); i++;
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instancedData.set(i, (Math.random() * 2.0 - 1.0) * scaleFactorVolume.z); i++;
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}
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}
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object.data.geom.setupInstanced(instancedData, 1, Usage.StaticUsage);
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}
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function fhash(n: Int): Float {
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var s = n + 1.0;
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s *= 9301.0 % s;
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s = (s * 9301.0 + 49297.0) % 233280.0;
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return s / 233280.0;
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}
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public function remove() {}
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/**
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Generates a random point in the triangle with vertex positions abc.
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Please note that the given position vectors are changed in-place by this
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function and can be considered garbage afterwards, so make sure to clone
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them first if needed.
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**/
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public static inline function randomPointInTriangle(a: Vec3, b: Vec3, c: Vec3): Vec3 {
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// Generate a random point in a square where (0, 0) <= (x, y) < (1, 1)
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var x = Math.random();
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var y = Math.random();
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if (x + y > 1) {
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// We're in the upper right triangle in the square, mirror to lower left
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x = 1 - x;
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y = 1 - y;
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}
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// Transform the point to the triangle abc
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var u = b.sub(a);
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var v = c.sub(a);
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return a.add(u.mult(x).add(v.mult(y)));
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}
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}
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class Particle {
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public var i: Int;
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public var x = 0.0;
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public var y = 0.0;
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public var z = 0.0;
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public var cameraDistance: Float;
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public function new(i: Int) {
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this.i = i;
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}
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}
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#end
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